Everything done rightly - After 3 months no SERP move

I found un competitive keyword build niche site on May, now its almost 3 months, I slowly build around 450 backlinks which yahoo site explorer confirms. Still I am hanging on page 2 or 3 in various data centers of Google... why?

No one has answered you because you need to give us way more information to help you at all.
How many searches/mo is the term?
You say no movement, but you're on page 2/3? When did it get there? How old is the site?
What kind of links did you build?
How do you know its not competitive? Did you use traffic travis or some other software to measure this?

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